Fig. 1
Variation of the imaginary part of the frequency for the backward propagating wave with the flow speed and the ionisation fraction. The flow changes in the interval 10–60 km s-1 and the ionisation fraction varies between 0.5 (fully ionised plasma) and 1 (neutral gas). The horizontal curve is drawn at the Im(ω) = 0 and helps to visualise the transition of Im(ω)− from the positive to the negative domain.
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